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Documentos disponibles de esta editorial (33)
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Diffraction gratings are not always ideal but, due to the fabrication process, several errors can be produced. In this work we show that when the strips of a binary phase diffraction grating present certain randomness in their height, the intens[...]![]()
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The Finite-Difference Time Domain method has encountered several difficulties when analyzing dispersive materials. This is the case of the metal structures that configure an optical antenna. These devices couple the electromagnetic radiation to [...]![]()
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Rico-García, José María ; López-Alonso, José Manuel ; Lail, Brian ; Boreman, Glenn ; Alda, Javier | SPIE | 2004-12-06Fresnel Zone Plate Lenses (FZPLs) have been successfully coupled to infrared (IR) antennas producing a responsivity enhancement of about two orders of magnitude. However, their lateral extension may compromise their applicability in focal-plane-[...]![]()
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Rodriguez Schwendtner, E. ; Navarrete Fernández, María Cruz ; Esteban, Óscar ; Díaz Herrera, Natalia ; González Cano, Agustín | SPIE | 2015In this work, we show the feasibility of using the evanescent field of a microfiber to excite the fluorescence of a fluorophore deposited on the surface of a polymer optical fiber. The fluorescence intensity gathered by the polymer optical fiber[...]![]()
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Ultrathin amorphous silicon hydrogenated (aSi-H) solar cells grown on a one-dimensional (1-D) dielectric subwavelength gratings improve the short circuit current by a factor of more than 51% when compared with conventional, flat ultrathin aSi-H [...]![]()
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Vázquez Moliní, Daniel ; González Cano, Agustín ; Díaz Herrera, Natalia ; Llombart, N. ; Alda, Javier | SPIE | 2012-10-15The history of optics is a very rich field of science and it is possible to find many simple and significant examples of the application and success of the experimental method and therefore is a very good tool to transmit to the student the way [...]![]()
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Vázquez Moliní, Daniel ; Álvarez Fernández Balbuena, Antonio ; García Botella, Ángel ; Alda, Javier | SPIE | 2015-08-25In this contribution the line flow method is applied to an optimized secondary optics in a photovoltaic concentration system where the primary optics is already defined and characterized. This method is a particular application of photic field t[...]![]()
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Martínez Antón, Juan Carlos ; Vázquez Moliní, Daniel ; Muñóz de la Luna, Javier ; Gómez Pedrero, José Antonio ; Álvarez Fernández-Balbuena, Antonio | SPIE | 2011-09-21Fresnel lenses and other faceted or micro-optic devices are increasingly used in multiple applications like solar light concentrators and illumination devices, just to name some representative. However, it seems to be a certain lack of adequate [...]![]()
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Photonic crystal microcavities are defined by the spatial arrangement of materials. In the analysis of their spatial temporal mode distributions Finite-Difference Time-Domain (FDTD) methods have proved its validity. The output of the FDTD can be[...]![]()
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Vázquez Moliní, Daniel ; Muñoz de Luna Clemente, Javier ; Álvarez Fernández-Balbuena, Antonio ; García Botella, Ángel ; Belloni, Paola ; Alda, Javier | SPIE | 2012-10-15One of the key challenges in the teaching of Optics is that students need to know not only the math of the optical design, but also, and more important, to grasp and understand the optics in a three-dimensional space. Having a clear image of the[...]![]()
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Rico-García, José María ; Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Alda, Javier | SPIE | 2009-06-17Polygonal Fresnel zone plates with a low number of sides have deserved attention in micro and nanoptics, because they can be straightforwardly integrated in photonic devices, and, at the same time, they represent a balance between the high-focus[...]![]()
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We propose in this work a model for describing visual acuity (VV) as a function of defocus and pupil diameter. Although the model is mainly based on geometrical optics, it also incorporates nongeometrical effects phenomenologically. Compared to [...]![]()
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Bértolo, Helder ; Mestre, Tiago ; Barrio de Santos, Ana Rosa ; Antona Peñalba, Beatriz | SPIE | 2017-12-22Our objective was to evaluate rapid eye movements (REMs) associated with visual dream recall in sighted subjects and congenital blind. During two consecutive nights polysomnographic recordings were performed at subjects home. REMs were detected [...]![]()
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Cuadrado, Alexander ; Silva-López, Manuel ; López-Alonso, José Manuel ; Martínez Antón, Juan Carlos ; Ezquerro Rodríguez, José Miguel ; González, Francisco Javier ; Alda, Javier | SPIE | 2015-08-28One of the main technical difficulties in the fabrication of optical antennas working as light detectors is the proper design and manufacture of auxiliary elements as load lines and signal extraction structures. These elements need to be quite s[...]![]()
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Mora Ventura, Brhayllan ; Díaz de León, Ramón ; García Torales, Guillermo ; Flores, Jorge L. ; Alda, Javier ; González, Francisco J. | SPIE | 2016-05-02Seebeck nanoantennas, which are based on the thermoelectric effect, have been proposed for electromagnetic energy harvesting and infrared detection. The responsivity and frequency dependence of three types of Seebeck nanoantennas is obtained by [...]